Pressure gauge



July 10, 1923. EAQLZM) K. R. STRANDELL PRESSURE GAUGE Filed Feb. 2, 1921f/ INVEN TOR.

J 'L I Patented July l, 1923.

1. and tea mm 1 v 1 time a n w KNUT E. STRANDELL. 01 SYIFQACUSE, NE'WYGBK.

PRESSURE GAUGE.

Application filed February 2, 121. Serial No. M1316.

To cal/Z "whom 157' may concern Be it known that l, liner Bonner STRAN-DELL, a subject of the King of Sweden, a resident of the United States,a resident of'Syracuse, in the county 0t Onondaga and State of New York,have invented a certain new and useful. Pressure Gangs, of which thefollowing is a specification.

This invention relates to pressure gauges and has for its object aparticularly simple and efficient construction by which the mechanismand dial of the are relieved of pressure when the actuating element, asa Bourdon tube, breaks and permits the'internal pressure to escape.

The invention consists in the novel features and in the combinations andconstructionshereinafter set forth and claimed.

In describiig this invention, reference is had to the accompanyingdrawings, inwhich like characters designate corresponding parts in allthe views.

Figure 1 is a front elevation, the dial or gauge plate and indicatorbeinc; removed.

Figure 2 is a rear elevation, the rear cover plate being removed.

Figure 3 is a sectional view on line 3--3, Figure 1.

Figure 1 is an enlarged fragmentary sectional view on line l.i, Figure1.

This pressure gauge comprises generally a casing having a closed chamberin which is located the actuating element, which is operated by pressureas steam or air, a dial mounted onthe front of the casing, an indicatormovable over the dial plate and mechanism located within the casing, butoutside of said chamber for actuating the indicator, said mechanismincluding a portion, as a shaft, journalled in the wall of the casingand connected at its inner end to the actuating element. This elementmay be of any type, as a diaphragm or Bourdon tube, and for the sake ofbrevity and convenience is referred to in the specification and claimsas a Bourdon tube.

1 designates the casing which is here shown as circular or cylindricalin general form, the casing being also formed with an arc-shaped andnearly annular chamber 2, which encloses a central space 3 within thecasing this space 3 being open at its front side and having a rear wall4. The chamber '2 is closed at its front, rear and outer or peripheraland inner sides and at its ends, the rear side being detachable andcomprising a circular plate 5 which overlies the wall 1 and which isyieldingly held in position. 6 the dial plate mounted on the front sideof tne casing 1 and extending over the front end of the space 3. 7 isthe indicator or hand movable over the dial, and 8 is a suitable lensheld in position by ring 9 threading on the periphery of the casing 1.1O des nates the Bourdon tube, mounted in the chamber 2 and having meansfor connection in the pressure pipe.

The mechanism for actuat c" the indicator 7, that is, the connectionsbetween the Bourdon tube and the indicator .7, comprises a rock shaft 11journalled in an inset portion 12 of an end wall of the chamber andconnected at its inner end to the Bourdon tube and at its outer ends tothe indicator. it." here illustrated, the connections to the indicatorcomprises a shaft 13 arranged coaxi v of the casing 1 and supported atits front end in the bracket to be presently described and in the rearwall 1 of the space 3, a pinion 15 mounted on the shaft and a lever 16pivoted at 17 and having a segment 18 at one end meshing with the pinion15 and connected at its other end by a link 19 to a rock arm 20 on theouter or rear end of the shaft 11. The shaft 11 is connected at itsinner end to the free end of the Bourdon tube by a link 21, which isconnected at 22 to a rock arm 23 on the innor end of the shaft 11. Thelever 16 is composed of two parts adjustable endwisely relativelyto eachother and held in their adjusted position by the clamping member 2a. Thepivot 17 of the lever is carried by the bracket 14 which is secured tothe wall 4 of the casing by screws 25. This bracket 14: has an openingor hearingfor the shaft- 13. The lever16 and the link 18 extend in thespace 26 between the ends of the circular chamber 2 which space 26communicates with the space 3.

The rear wall 5 of the chamber 2 is yieldingly held in position bysprings 27 interposed between the heads of screws 28 and inturnedflanees or seats 29 provided on tubes or thimbles projecting from theplate 5, the screw threading into lugs 30 extendinc: into the space 3.

In operation, motion is transmitted from the Bourdon tube to the shaft.13 through the rock shaft 11 and the lever 16 and the joint or hearingof the rock shaft is suitably packed to prevent the escape or": pressurefrom the chamber 2 into the spaces 3 and 26 so that, it the Bourdon tubebreaks or explodes the steam pressure will not break the gauge mechanismand the dial and is free to escape Without doing injury past thespringpressed plate 5.

What I claim is:

1. A pressure gauge comprising a casing, a Bourdon tube in the casing,the casing being formed with an are shaped. chamber in which the tubelocated, a dial plate on the trout ot' the casing, an indicator movableV91 the dial and mechanism in the rear of the plate and outside of saidchamher for actuating the indicator, said mechanism comprising a rockshaft extending through a Wall of said chamber and con nected to theBourdon tube to berocked thereby.

2. A pressure gauge comprising a casing, 21 Bourdon tube in the casing,the casing being formed With an arc-shaped chamber in which the tube islocated, adial plate on the front of the casing, an indicator movableover the dial and mechanism in the rear of the plate and outside of saidchamher for actuating the indicator, said mechanism comprising a rockshaft extending through Wall of said chamber and connected to theBourdon tube to be rocked thereby, a wall closing the rear side of thechamber being yieldingly held in position, and means for yieldinglysecuring the Wall to the casing.

3. A pressure gauge comprising a cylindrical casing having an arcuatechamber closed at its front side and ends, and its inner and outerarc-shaped sides, the ends being spaced apart, the casing also having awall on its rear side closing the rear end of the space confined by theinner arcuate wall and the end Walls of said chamber and the peripheralWall of the casing, a dial mounted on the front of the casing, an indicator movable over the dial and a Bourdon tube mounted in said arcuatechamber, mechanism for actuating the indicator comprising a shaftextending through a Wall of said arcuate chamber and connected at itsinner end to the Bourdontube, and means for transmitting the motion ofthe rock shaft to the indicator, such means being located in the spaceencompassed by the inner Wall of the arcuate chamber, and a Wall closingthe rear side of the arcuate chamber, and means for yieldingly securingthe same to the casing.

In testimony whereof, I have hereunto signed my name, at Syracuse, inthe county of Onondaga, and State of New York, this 21st day of October,1920. i

' KNUT R. STRANDELL.

